Deadbolt



FIG. 1 is a perspective view of the new design for a deadbolt;

FIG. 2 is a side elevational view of the new design for a deadbolt;

FIG. 3 is a front elevational view of the new design for a deadbolt; and,

FIG. 4 is a rear elevational view of the new design for a deadbolt.

The broken lines are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a deadbolt, as shown and described. 